Ivan Shishkin, Pine Forest

Weekly Problem Design Contest

Contest open

Pascal's Ghost

Starts Saturday, September 12, 2026 Deadline Friday, September 18, 2026 · Paris time Prize 300 reputation points

Create a problem on the theme “Pascal’s Ghost.”

Your problem may be inspired by Blaise Pascal, his work, or mathematical ideas associated with him: Pascal’s triangle, combinatorics, games of chance, or even projective geometry…

The “ghost” may be a hidden theme or, on the contrary, an actual ghost.

Feel free to interpret the theme however you like!

How entries are judged

  • Fit to the weekly theme
  • Originality
  • Mathematical interest
  • Clarity
  • Presentation

Rules

One entry per person. You may edit your problem until Friday at 23:59, Paris time. Admins select one winner and may also award honorable mentions. Translations of the same problem count as one entry.

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Entries

1
50Le carré de Pascal et son grand théorème ?FRDattier